Maybe malware isn't a problem, but many times malware also causes popups and ads. If you get these stupid add-ons that come piggy-backed on downloads, they are very difficult to remove. Remember how you had dozens and dozens of them on the Vista computer? If you have a particular one, post what it is... there are some things you can do, but sometimes they are very stubborn and you just have to disable. Adwcleaner has been very effective for me in removing some of the worst ones... but each one is different.